There were lots of commits that could break things. :-)
Can you compile up some intermediary versions between 315141 and
r317559 to find which commit range broke things? That'll make chasing
it down much quicker!
Thanks!

FWIW I'm seeing this on the drm-next repository after the latest merge
from upstream which happened on April 30th. I'll try to put some cycles
into trying to find a range of potential commits that is causing this.